The biggest issue i see coming up is as Lee started the other post with, that this is supposed to be an easy game creator, that can do all manner of different game types and genres, however in reality, out of the box all it can do is a fairly rudimentary FPS and a VERY basic 3rd person, which to be honest really needs a lot of edge smoothing and many more features (things like being able to change weapons, having bullets fire in the direction the gun is pointing and not on the cursor which leads to shooting through entities etc). We need more genre types out of the box, because without them the description is perceived as a lie (even though most can be done by scripting, that's not what many people see, they see an engine that says it can do one thing, but can't).
Coupled with that, the fact that the default scripts leave a lot to be desired, they function, they do what they're supposed to, but the can be finicky, sometimes just not working, other times you have to mess around and tweak them to get them working. If you supply scripts with the product they should be ready to use out of the box without having to mess with them, one example is the music.lua system, it's really not obvious what you have to do, and expecting someone to go into the script and edit it so they can have their own music makes it more complicated than you want, not to mention there's not really much of a pointer as to how to use it, it took me ages to work out you don't actually use the music.lua in the level, but use the other scripts to reference it, this sort of thing seems to be a recurring theme here, and don't get me started on AI, there's been nothing but issue after issue with the AI scripts and AI behavior in general.
Hand in hand with the scripting issues, another thing that puts people off, is the over dependency of GameGuru on 3rd party software. I can understand that modelling shouldn't be done in the engine, that's a given, however if you want GameGuru to be a truly easy game maker then don't go sending them to notepad to edit scripts, add a script editor, some sort of node system or similar might make things seem easier. Likewise, importing models needs to be easier, we need to be able to import more file types, more poly's, and more bones, we also need the option to add a new model in the editor, and choose the textures there and then, with all its fpe options available in the properties panel.
And finally, half finished features, this is a huge issue, some great features have been added to gameguru over time, but many of them feel like they've been coded up to the point where someone's said "yeah that'll do, it's good enough", a prime example is the character creator, i see so many people asking how to bring in characters etc, but they won't use the creator because it's just so limited, and to be honest all its characters pretty much look the same with different clothes and colours, the reason people are trying to import 3rd party characters is because they don't want all their characters to look the same, much more variety is needed for the character creator to actually be viable, many more interchangeable body parts, not just head, body, pants etc. but actual limbs; arms, legs, torso, hair etc. and sliders to adjust their sizes.
Anyway, that's my two penneth, and how i perceive that gameguru can be improved and made "easier", many might disagree, but that's my opinion.
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